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suter [353]
4 years ago
13

Solve the system by the elimination method 7x+5y=-25 5x+3y=-23

Mathematics
1 answer:
aksik [14]4 years ago
5 0

Step-by-step explanation:

7x+5y=25 ×3 7×-1.5+5y=25

5x+3y= -23 ×5 -10.5 +5y =25

5y= 25 + 10.5

21x+15y=75 5y= 35.5

25x+15y=69 y= 7.1

-4x=6

x=-1.5

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the variables y and x have a proportinal relationship and y=12 when x=5 . what is the value of y when x=8?
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Answer:

y = \frac{96}{5}

Step-by-step explanation:

given that y and x are proportional then the equation relating them is

y = kx ← k is the constant of proportionality

to find k use the given condition y = 12 when x = 5

k = \frac{y}{x} = \frac{12}{5}

y = \frac{12}{5} x ← equation of proportionality

when x = 8, then

y = \frac{12}{5} × 8 = \frac{96}{5}


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